From: Amit Shah <amit.shah@redhat.com>
To: Jitendra Kolhe <jitendra.kolhe@hpe.com>
Cc: ehabkost@redhat.com, kvm@vger.kernel.org, quintela@redhat.com,
qemu-devel@nongnu.org, liang.z.li@intel.com, dgilbert@redhat.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org, mst@redhat.com,
mohan_parthasarathy@hpe.com, simhan@hpe.com, pbonzini@redhat.com,
akpm@linux-foundation.org,
virtualization@lists.linux-foundation.org, rth@twiddle.net
Subject: Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization
Date: Tue, 8 Mar 2016 16:44:43 +0530 [thread overview]
Message-ID: <20160308111443.GN15443@grmbl.mre> (raw)
In-Reply-To: <1457083967-13681-1-git-send-email-jitendra.kolhe@hpe.com>
On (Fri) 04 Mar 2016 [15:02:47], Jitendra Kolhe wrote:
> > >
> > > * Liang Li (liang.z.li@intel.com) wrote:
> > > > The current QEMU live migration implementation mark the all the
> > > > guest's RAM pages as dirtied in the ram bulk stage, all these pages
> > > > will be processed and that takes quit a lot of CPU cycles.
> > > >
> > > > From guest's point of view, it doesn't care about the content in free
> > > > pages. We can make use of this fact and skip processing the free pages
> > > > in the ram bulk stage, it can save a lot CPU cycles and reduce the
> > > > network traffic significantly while speed up the live migration
> > > > process obviously.
> > > >
> > > > This patch set is the QEMU side implementation.
> > > >
> > > > The virtio-balloon is extended so that QEMU can get the free pages
> > > > information from the guest through virtio.
> > > >
> > > > After getting the free pages information (a bitmap), QEMU can use it
> > > > to filter out the guest's free pages in the ram bulk stage. This make
> > > > the live migration process much more efficient.
> > >
> > > Hi,
> > > An interesting solution; I know a few different people have been looking at
> > > how to speed up ballooned VM migration.
> > >
> >
> > Ooh, different solutions for the same purpose, and both based on the balloon.
>
> We were also tying to address similar problem, without actually needing to modify
> the guest driver. Please find patch details under mail with subject.
> migration: skip sending ram pages released by virtio-balloon driver
The scope of this patch series seems to be wider: don't send free
pages to a dest at all, vs. don't send pages that are ballooned out.
Amit
next prev parent reply other threads:[~2016-03-08 11:15 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-04 9:32 [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization Jitendra Kolhe
2016-03-04 9:36 ` Li, Liang Z
2016-03-08 11:14 ` Amit Shah [this message]
-- strict thread matches above, loose matches on Subject: below --
2016-03-03 10:44 Liang Li
2016-03-03 13:58 ` Roman Kagan
2016-03-04 1:35 ` Li, Liang Z
2016-03-03 17:46 ` Dr. David Alan Gilbert
2016-03-04 1:52 ` Li, Liang Z
2016-03-04 8:14 ` Roman Kagan
2016-03-04 9:08 ` Li, Liang Z
2016-03-04 10:23 ` Roman Kagan
2016-03-04 14:26 ` Li, Liang Z
2016-03-04 14:45 ` Michael S. Tsirkin
2016-03-04 15:49 ` Li, Liang Z
2016-03-05 19:55 ` Michael S. Tsirkin
2016-03-07 6:49 ` Li, Liang Z
2016-03-07 11:40 ` Michael S. Tsirkin
2016-03-07 15:06 ` Li, Liang Z
2016-03-09 14:28 ` Roman Kagan
2016-03-09 15:27 ` Li, Liang Z
2016-03-09 15:30 ` Michael S. Tsirkin
2016-03-10 1:41 ` Li, Liang Z
2016-03-10 12:29 ` Michael S. Tsirkin
2016-03-09 15:41 ` Michael S. Tsirkin
2016-03-09 17:04 ` Roman Kagan
2016-03-09 17:39 ` Michael S. Tsirkin
2016-03-10 10:21 ` Roman Kagan
2016-03-09 19:38 ` Rik van Riel
2016-03-10 9:30 ` Roman Kagan
2016-03-04 16:24 ` Paolo Bonzini
2016-03-04 18:51 ` Dr. David Alan Gilbert
2016-03-07 5:34 ` Li, Liang Z
2016-03-09 13:22 ` Roman Kagan
2016-03-09 14:19 ` Li, Liang Z
2016-03-09 6:18 ` Li, Liang Z
2016-03-04 7:55 ` Roman Kagan
2016-03-04 8:23 ` Li, Liang Z
2016-03-04 8:35 ` Roman Kagan
2016-03-04 9:08 ` Dr. David Alan Gilbert
2016-03-04 9:12 ` Li, Liang Z
2016-03-04 9:47 ` Michael S. Tsirkin
2016-03-04 10:11 ` Li, Liang Z
2016-03-04 10:36 ` Michael S. Tsirkin
2016-03-04 15:13 ` Li, Liang Z
2016-03-08 14:03 ` Michael S. Tsirkin
2016-03-08 14:17 ` Li, Liang Z
2016-03-04 9:35 ` Roman Kagan
2016-03-08 11:13 ` Amit Shah
2016-03-08 13:11 ` Li, Liang Z
2016-03-10 7:44 ` Li, Liang Z
2016-03-10 7:57 ` Amit Shah
2016-03-10 8:36 ` Li, Liang Z
2016-03-10 11:18 ` Dr. David Alan Gilbert
2016-03-11 2:38 ` Li, Liang Z
2016-03-14 17:03 ` Dr. David Alan Gilbert
2016-03-15 3:31 ` Li, Liang Z
2016-03-15 10:29 ` Michael S. Tsirkin
2016-03-15 11:11 ` Li, Liang Z
2016-03-15 19:55 ` Dr. David Alan Gilbert
2016-03-16 1:20 ` Li, Liang Z
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